Knight Commander Attack 20Control the Field
You dominate the field of battle so strongly that enemies find your mere presence overwhelming.
Daily Martial, Weapon
Standard Action Melee weapon
Target: One creature
Attack: Strength vs. AC
Hit: 3[W] + Strength modifier damage.
Effect: Each enemy within 5 squares of you is marked until the end of your next turn, and each takes ongoing 10 damage (save ends). While adjacent to you, an enemy takes a penalty to saving throws against this ongoing damage. The penalty equals your Charisma modifier.
Published in Player's Handbook, page(s) 155, Class Compendium.